Check your power connections. It sounds like you may have a loose connection 
that is OK in receive but as soon as transmit current starts to flow the 
voltage drops low enough to shut off the K3.

73,
Chuck - AA3CS

On 27 May 2011, at 11:25, John/K8AZT wrote:

> My K3 sn1693 has just started exhibiting a troubling problem.  Operation in 
> CW 
> when I put key down, the rig shuts off completely.  When turning back on, it 
> forgets frequency that was set just prior to shut down.  I thought this might 
> be 
> rf in shack, so tried with dummy load and same problem.
> 
> Any suggestions or has anyone else experienced this behavior?
> 
> 73,
> John/K8AZT
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